| Nurse practitioner | 676 |
| Physician assistant | 399 |
| Physical therapist (private practice) | 219 |
| Family practice | 210 |
| Internal medicine | 172 |
| Anesthesiologist Assistant | 166 |
| Chiropractic | 164 |
| Certified Registered Nurse Anesthetist (CRNA) | 116 |
| Anesthesiology | 102 |
| Optometrist | 100 |
| Diagnostic Radiology | 94 |
| Emergency medicine | 92 |
| Hospitalist | 88 |
| Obstetrics/gynecology | 86 |
| Licensed clinical social worker | 81 |
| Mental Health Counselors | 75 |
| Mass Immunization Roster Billers | 66 |
| Orthopedic surgery | 61 |
| Cardiology | 59 |
| Occupational therapist (private practice) | 58 |
| Clinical psychologist | 55 |
| General surgery | 54 |
| Neurology | 52 |
| Psychiatry | 51 |
| Gastroenterology | 50 |
| Centralized Flu | 49 |
| Ophthalmology | 49 |
| Podiatry | 39 |
| Pathology | 37 |
| Ambulatory Surgical Center | 34 |
| Audiologist (billing independently) | 33 |
| Pulmonary disease | 32 |
| Dermatology | 30 |
| Urology | 30 |
| Physical medicine and rehabilitation | 27 |
| Nephrology | 26 |
| Hematology/oncology | 25 |
| Otolaryngology | 21 |
| Critical care (intensivists) | 19 |
| Rheumatology | 18 |
| Radiation oncology | 18 |
| Endocrinology | 18 |
| Plastic and reconstructive surgery | 18 |
| Interventional Cardiology | 17 |
| Hospice and Palliative Care | 15 |
| Vascular surgery | 14 |
| Neurosurgery | 10 |
| Pain Management | 10 |
| Speech / language pathology | 10 |
| Clinical Laboratory (Billing Independently) | 9 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 9 |
| Infectious disease | 9 |
| Allergy/immunology | 8 |
| Certified nurse midwife | 7 |
| Hand surgery | 7 |
| Independent Diagnostic Testing Facility (IDTF) | 7 |
| Thoracic surgery | 7 |
| Pharmacy | 6 |
| Cardiac Electrophysiology | 6 |
| Medical oncology | 6 |
| Pediatric medicine | 6 |
| Marriage and Family Therapist | 5 |
| Interventional Pain Management (IPM) | 5 |
| Registered Dietician/Nutrition Professional | 5 |
| Interventional radiology | 5 |
| Maxillofacial surgery | 5 |
| Nuclear medicine | 4 |
| Sports Medicine | 4 |
| Oral surgery (dentists only) | 4 |
| Colorectal surgery (formerly proctology) | 3 |
| Opioid Treatment Program | 3 |
| Undersea and Hyperbaric Medicine | 3 |
| Hematology | 3 |
| Surgical oncology | 3 |
| General practice | 3 |
| Sleep Medicine | 2 |
| Advanced Heart Failure and Transplant Cardiology | 2 |
| Gynecologist/oncologist | 2 |
| Geriatric medicine | 2 |
| Public Health or Welfare Agencies (Federal, State, and local) | 1 |
| Certified clinical nurse specialist | 1 |
| Home Infusion Therapy Services | 1 |
| Micrographic Dermatologic Surgery | 1 |
| Unknown Provider | 1 |
| Cardiac surgery | 1 |
| Psychologist (billing independently) | 1 |
| Neuropsychiatry | 1 |
| Preventive medicine | 1 |
| Adult Congenital Heart Disease | 1 |
| All other suppliers, e.g., Drug Stores | 1 |
| Addiction medicine | 1 |